17032-11-0Relevant articles and documents
Photoionization-Induced Intracluster Reactions of Chlorobenzene/Ammonia Mixed Complexes
Grover, J. R.,Cheng, B.-M.,Herron, W. J.,Coolbaugh, M. T.,Peifer, W. R.,Garvey, J. F.
, p. 7479 - 7487 (1994)
Complexes of chlorobenzene and ammonia, C6H5Cl*NH3, C6H5Cl(NH3)2, and C6H5Cl(NH3)3, were studied by single-photon ionization.The ionization potentials of these three complexes were measured to be 8.744 +/- 0.022, 8.652 +/- 0.013, and 8.555 +/- 0.012 eV, respectively.The appearance potential of C6H5NH3+ from C6H5Cl*NH3 was found at 8.935 +/- 0.004 eV, which, with the known heat of formation of anilinium ion, gives the dissociation energy D(C6H5Cl*NH3) = 2.9 +/- 0.5 kcal mol-1 (12.0 +/- 2.2 kJ mol-1).Then, from its onset energy from C6H5Cl*NH3, the dissociation energy of (C6H5Cl*NH3)+ is calculated to be D+> = 10.4 +/- 0.7 kcal mol-1 (43.5 +/- 2.9 kJ mol-1), unusually large for a heterodimer ion.No production of C6H5NH3+ from trimers could be detected in the onset region.The ion C6H5NH2+ has onsets of 8.849 +/- 0.009 and 8.855 +/- 0.029 eV from C6H5Cl*NH3 and C6H5Cl(NH3)2, respectively.These energies are below the onset for C6H5NH3+ but far above the thermochemical thresholds for aniline ion, which are near 7.6 eV.Evidently, C6H5NH2+ is not produced by dissociative ionization of the excited neutral complex.Instead, the complex must first be ionized and excited to at least 0.1 eV.Since the onsets for (C6H5Cl*NH3)+ and C6H5NH2+ are lower that for C6H5NH3+, then (C6H5Cl*NH3)+ in its ground state does not spontaneously form C6H5NH3+.Kinetic energy release distributions measured for C6H5NH2+ and C6H5NH3+ indicate that the formation of both ions is consistent with statistical process; i.e., no evidence for nonstatistical mechanisms was found, even for photon energies as large as 17.7 eV.
Nucleophilic Substitution within the Photoionized van der Waals Complex C6H5Cl-NH3
Maeyama, Toshihiko,Mikami, Naohiko
, p. 6973 - 6977 (1990)
Efficient generation of C6H5NH3+ was found after the selective ionization of the van der Waals complex C6H5Cl-NH3 which was prepared in a supersonic molecular beam.The action spectrum of the product and its appearance energy were observed by using the two-color mass-selected multiphoton ionization spectroscopy.From the energetics of the reaction it was concluded that the ion-molecule reaction is responsible for the process and the product is generated by the nucleophilic substitution reaction occurring within the photoionized van der Waals complex.
IR absorption spectra of aniline cation, anilino radical, and phenylnitrene isolated in solid argon
Chou, Sheng-Lung,Lin, Shu-Yu,Tseng, Chien-Ming,Wu, Yu-Jong
, (2022/04/12)
Electron bombardment of aniline (PhNH2) in an Ar matrix mainly generated the aniline cation (PhNH2+), anilino (PhNH) and phenyl (Ph) radicals, and phenylnitrene (PhN). Further irradiation of the electron-bombarded matrix s
Investigation of Reaction Barriers in Mixed Organic Aggregates by Two-Color Resonant Two Photon Ionization
Awdiew, J.,Riehn, Ch.,Brutschy, B.,Baumgaertel, H.
, p. 1353 - 1357 (2007/10/02)
We used two-color resonant two-photon ionization combined with time-of-flight mass spectrometry to study nucleophilic ipso-substitution reactions with halobenzenes radical cations.Molecular clusters serve as microscopic test tubes to tackle the reactivity problem of solvated radical cations.The reaction paths - van der Waals fragmentation and chemical reaction - could be energetically separated.The substitution reactions turned out to be nearly activationless.The particularities of the excitation process are discussed.
